Sectional sewer-mold.



W/TNESSES PATENTED DEC. 31, G. GEORGBNSON.

SBGTIONAL SEWER MOLD.

APPLIGATION FILED APR 16, 1007.

INVENTOH GEDREE EEuRsmusuN ATTORNEYS No. 875,518. PATENTED DEC. 31, 1907.

G. GBOHGENSON.

SEOTIONAL SEWER MOLD. APPLICATION FILED APR 16,1907.

2 SHEETSSHEET 2.

6.5 M 7f GEUR E @EURBENSUN.

ATTORNEYS i the staves without any abut rarnnr orrrcn GEORGE GEORGENSON, OF WILMINGTON, NORTH CAROLINA.

SE CTIONAL SEWER-MOLD.

Specification of Letters Eatent.

' Patented Dec. 31, 1907.-

Application filed April 16. 1907 Qerial No. 368,524.

To all whom it may concern:

Be itknown that I, GEORGE GEORGENSON, a citizen of the United States, and resident of-Nihnington, in the county of New Hanover and State of North Carolina, have invented an Improved Sectional SewerMold, of which the following is a specification.

My invention is designed to provide a sectional sheet metal sewer mold, which may be built up in indefinite lengths in the sewer preparatory to packing the cement concrete around the same, and be built up progressively to a higher level by the addition of new panels, as the level of the concrete rises until the circular form of the mold is completed, and it consists in the novel construction and arrangement of the sectional sewer mold capable of extensible construction as above described, and which is also so constructed as to be readily collapsed and taken to pieces from the interior after the cement hardens.

In the drawing, Figure 1 is a perspective view of two panels of one'length of my sewer moldin process of being built up around the circular brace hoops. Fig. 2 is a longitudinal section of a completed length ol mold. 3 is a transverse section of the sewer mold taken through the brace hoop. 'Fig. 4 is a similar transverse section taken through the registering. tongues and loops of the panels. F 5 is a perspective view of a single de tached panel. Fig. 6 is a view on a smaller scale, partly in section, showing the method of laying the panels with lap joints; and Fig. 7 is a detail of the diametrical brace.

My sectional sewer mold is composed of three separate elements. The first is a series of panels A, seen in detail in Fig. 5, each of which is made of stout sheet metal bent to the arc of a circle, so as to form a sort of stave, with which other similar staves or panels, form when put together a co1nplete circular mold. These staves are of much greater length than width, which width is of a curved cross section, and the longitudinal edges are only the thickness or n flanges.

The second element isthe circular brace hoop B, seen in Fig. 1, on which the staves or panels are held, and the third element is the diametrical transverse brace bars D, D, Figs. 3 and 7, which hold the form distended against any collapsing pressure.

Each panel-seeFig 5is made with two or more tongues c a projecting along one longitudinal edge, two or more loops 6 I) along 'the set 0 c.

Fig.

the other longitudinal edge, each tongue a being in the same transverse plane as the loopclips is located at the extreme, end of the panel, and the free ends of the clips trend outwardly, while the other sets, as cl (1, are located at uniformly distributed points from The spacing of the clips (2 at a distance from the end oi the panel is to permit of the laying of the panels with lap oints, as hereafterdescribed. 1

The brace hoops B have separable ends provided with longitudinal slots is, and are connected together adjustably by bolts t passing through said slots. l

The panels A are connected to the hoops by the clips 0 and (1 which are adjusted endwise up to the hoops, the hoops occupying a position between the clips and the panels, as seen in Figs. 1 and 2. The tongues do of one panel are entered into the loops 1) b on the adjacent edge of the next panel, so that i when all the panels are in place on the hoops 13, they constitute a complete tubular form or mold, around the exterior of which the cement material is packed and allowed to harden to form the sewer. The complete tubular form has, however, when completed, an overlap where the last applied panel overlaps the iirst, as seen at the bottom of Figs. 3 and i. This not only permits of adjustment of the size of the circular cross section but permits of the separate removal of the panels or staves and collapse of the mold when it is to be taken out.

.To permit the overlap to take place with the lastpanel, the tongues a a and clips c c at the free overlapping edge of the last panel are removed so as to permit this overlap without interference of said tongue and clips with the edge of the first panel.

In the interior faces of the hoo s B, are

a bolt f. This bolt passes t irough the slots in the toothed ends of the bars, and two suchsectional brace bars are arranged at The operation of building 11 and removing my sectional mold is as ollows. The

trench for the sewer being prepared with'a" bed of cement concrete, two or more of the panels are connected to the lower portion of the hoops, as seen in Fig. 1, the mold being extended longitudinall in this way any desired length along the ottom of the trench. The cement concrete is then filled in around the sides and packed and then other panels A are put on the sides, as the level of the concrete rises, until all the panels are on the hoops and form a complete tubular mold,

the concrete being finall carried entirely over the top of the mold in sufficient thickness to form the sewer. After'the concrete has set, the mold is removed ,as follows. The braces D D are first removed and the hoops loosened b the screw nuts connecting their ends and the panels of the form may then be sufficiently collapsed to allow them to be icked out one at a time.

In aying the sewer form, the ends of the I panel sections in one circumference can be' made to terminate in the same crosssectional plane as in Fig. 2, but are preferably laid Wltllalternating panels of one section lapping past theintermediate panels of the next section, as seen in Fig. 6. For this Eur ose the first section of the mold has one al the panels only the length between clips 0 and d,-and the other half of the anels are the full length shown in Fig. 2. his causes the panels to make break joints at the end of the first section of the tube, and after this break joint arrangement is established, the

construction of the sewer mold with break joints isv carried out. with the regular full length panel section seen in Fig. 5.

The panels are inside. SIZG of the hoops, the anel sectlons are capable of adjustment to arger or smaller sewers within certain limits, and, the forms are quite economical, easily placed and remdwed and also conveniently transported and compactly stored. The sewer may also be made of circular, or semi-circular form, or any other desired shape in cross section.

I claim: '1. A sewer mold, comprlsmg a series of staves curved m crosssectlon and of greater erfectly smooth on the outside, and allof t e connections are on the By increasing or diminishing the length than width, each bearing along one longitudinal edge one or. more laterally projecting tongues, and on the other longitudinal edge one or more loops in the same transverse plane with the tongues and also having hook shaped clips at the ends on the inner sides and circular brace hoops with overlapping slotted ends arranged inside the panels.

and between the panels and the hook clips, said hoops being provided with bolts for adjustably connecting its ends.

2. A sewer mold, comprising separable brace hoops with overlapping and adjustable ends and a series of detachable panels forming together a complete tube, longitudinally adjustable hook clipson the inside of the panels for connecting them to the hoops, means for locking the panels to each other and diametrical braces arranged inside the hoops and made longitudinally extens ble.

3. A sewer mold, comprising separable brace hoops having on their inner faces indented seats, sectional panel's arranged outside the brace hoops and connected to them in series, to form a tube, and a diametrical brace having set screws at the opposite end adapted to enter the indented seats of the hoops.

,4. A sewer mold, comprising separable;

brace hoops, sectional panels arranged outside the hoops and connected to' them in sories to form a tube, and a diametrical brace consisting oftwo bars having at their inner ends longitudinal slots and teeth along the side of the same, and a bolt passing through theslots, said bars having at their outer ends adjustable set screws.

5. A sewer mold, comprising separable one or more laterally projecting tongues and at the other edge one or more loops in the same transverse plane withthe tongues; and having also one or more inwardly offsetting cli s at one end and a corresponding set of 0 setting clipsat a remote oint from the other en and circular braceli inside the anels and adapted to be connected to t joints.

' GEORGE GEORGENSON.

Witnesses:

Tnos. H. WRIGHT R. H. No'RTHRoP oops arranged e panels as arranged with lap 120 

